Kiln



UNITED STATES PATENT OFFICE.

i JMESHARRY LEMMON, OF MILLTOWN, INDIANA, ASSIGNOR T0 LOUISVILLE CEMENT COMPANY, OF LOUISVILLE, KENTUCKY, CORPORATION F KENTUCKY.

KILN.

To all whom it may concern Be it known that I, JAMES HARRY LEM- n'oN, a citizen of the United States, residing at Milltown, in the county of Crawford and `State of Indiana, have invented certain new and useful Improvements in Kilns, of

ticularly adapted for the burning of lime,

` cement and similar materials.

`In lime `and cement kilns, it has not heretofore been the general practice to employ a bridge wall, or partition, dividing the kiln into opposed chambers, because the bridge wall, under the action of the high heat involved, is subject to expansion and contraction, and being built up in connection with,` and as a part of, the outer wall of the kiln,

has had a tendency to buckle orcollapse, `and, also a tendenc tol injuriously afectthe outer wall of the ln proper, to whichthe bridge wall was connectedand of which y was an integral` art. 1 y y It is one of t efprimary objects of the present invention, therefore, `lto overcome existing objectionsin kilns, as heretofore constructed, to increase `the life of the kiln,

`without substantial increase in cost of production, and with a decrease in cost ofmaintenance, and to provide a more thorough and uniform calcination of the material passingthroughA the kiln.`

It is obvious, of course, that theimprovements herein `contemplated arereadil applicable to kilns of various designs an constructions, and while illustrated in connection with a stationary kiln, it is possible to secure advantageous results in connection `with a rotaryklln.` i i In carrying out the invention, it is `proposed to provide in" operative association with a surrounding wall forthe kiln, a longitudinally disposed bridge wall, orl artition,

y to divide the kiln into opposed c ambers,

Specication f Letters Patent.

Application led March 13, 1919. lSerial No. 282,503.

entirely independently of the side walls of the kiln proper, and spaced from said walls of the kiln at both its sides and edges, whereby to permit the bridge wall to expand` to a lclonsiderable extent under the action of the Again, the invention includes a novel construction of kiln wall and operatively associated bridge wall, the kiln wall being provided at opposite sides with alined recesses ada ted to receive the edges of the bridgewa l, the walls surrounding said recesses being spaced from opposite surfaces and edges of the bridge wall, and in the 4preferred embodiment ofthe invention, the

outer walls ofthe kiln being relatively thickened at said recessed parts.

The invention further includes means whereby the fuel supply, such as gas or oil, maybe introduced into the chambers of the kilnformed by said bridge wall or partition, at oints removed from the surrounding wal of the kiln to the end that such gas or oil, or other fuel, will be projected to a `large extentinto the central zone of the kiln to provide for a more uniform distribution of fuel among themass of material to be calcined, `the tendency of flarnes'and gases in previous construction, where the fuel supply is introduced only around the inner wall of the kiln, being to flow upward as soon as released in the interior of the kiln without reaching the mass ofmaterial in the central zone,..thereby creating a variable condition of calcination; and in carrying out this feature of the invention it is proposed to ntroduce the fuel, such as gas or oil through the ends ofthe bridge wall, thesaid fines connecting with laterally disposed outlets or ports in said bridge wall in direct contact with the mass of stone, etc., positioned in the chambers of the kiln to be burnt.

It is further contemplated by the invention to provide akiln of simple, novel and inexpensive construction, strong and durablefand highly efficient and satisfactory in use.

Still further improvements and novel details in the construction and arrangement of parts will be appreciated by those skilled 1n the art from the description to follow, when considered in connection with the accompanying drawings, which form a part thereof, and wherein is disclosed, for the purpose of illustration, a convenient and drawings, l is the outer surface and 2 the `Vthe recesses formed by *the kiln-walls, will be entirely independent and free ofthe sursatisfactory embodiment of the invention,

though it is to be bornein mind in this connection, that many minor changes in details and arrangements of parts may be resorted to without departing from the spirit of the invention.

inner surface of the surrounding wall kor liningk for the kiln, the said lining being constructed of any' ,suitable material for the purposesuch as fire brick, and taking a substantially cylindrical form. Since the top and bottom portions of the kiln, including the meansof feedand discharge, etc., constitute no part of the present invention, and

may take the form of any of the approved types, it is not necessary to illustrate or describe `them herein.

The surrounding wallV of the kiln is conveniently widened or thickened at 3,'tlie said widened portions being out out whereby to provide opposedrecesses 4L for the reception of al longitudinally. .disposedv bridge wall or partition 5. Y

.The birdge wall. 5. is conveniently constructed of any' suitable material for the purpose, the opposite'sides of the bridge wall conveniently being tapered inwardly as at 6k adjacent theupper edge thereof.

The bridge Wallis of a thickness slightly less than the width of the recesses 4:, whereby to leave a clearance space of suflicient area vbetween opposite surface of thebridge wall and the sidewalls of the recess l in the lining. Oppositeedges ofthe brick wall are conveniently curved, as at 7 to correspond to the general curvature of the outer surface or lining 1 of the kiln, but said bridge wall is of a length slightly less than `the diameter of the wall of the'kiln represented by the outer surface thereof, whereby to leave al free clearance sp-acepbetween said outer surface or lining 'of the kiln, and the edges of the vbridge wall. From the i construction thus 'far described,it will be observed that thatportionof the'bridge` wall positioned within rounding wall of'said recesses whereby to allow for all necessary expansion in the normal use of the kiln.

Advantage istakenof the bridge wall. to

deliver a part ofthe gas or fuel directly into the chambers of the kiln formed by said bridge wall, and with this in View, opposed conduits or lines k7 leading from any suitable source of supply, such as a gas producer, not illustrated, project through the outer lin ing of the kiln, thence through the ed frcs of the bridge wall to al point beyond tho inner` surface of the kiln wall. where .said lines connnunicate with laterally disposed pussages 8 I nojccting through Jdie bird ge wall for communication with the chinnbers formed by said bridge wall und the surrounding kiln will.

lt will be understood, of course, that other fines may be provided in the surrounding wall orlining of the kiln propel'.

lt is believed the operation and use of the kiln as above described. will be obvious. Since t-he bridge wall is built entirely indopendent of the wall of the kiln, the expansion and contraction of the bridge wall, incident to the high heat of the kiln, is taken care of without affecting the walls of the kiln or buckling or otherwise injuring the bridge wall itself. The wall of the kiln is reinforced at tho recesses provided for thc accommodation of the bridge wall by the thickened mass of material constituting the lin-ing,` and the'gas or fuel supply is more properly distributed throughout the entire body of the kiln, by the introduction of the fuel, through the flues or conduits inthe bridge wall.

What I claim is:

l. In a kilnof the character described, the combination of an outer wall and a. bridge wall separate therefrom, the sides and ends of said bridge wall being` spaced from the outer wall to allow free expansion and contraction thereof.

2. ln a kiln of the character described, the combination of an outerwall having opposed recesses.l and an interior bridge wall, along. the kiln positioned within said recesses and spaced from the walls thereof. substantially as and for the purpose dcscribed.

3. l'n a kiln of the character described, the combination of un outer wall. having associated means forming opposed receiving' channels, and a bridge wall with opposite sides thereof disposed within said channels and spaced from contact with the walls thereof.

4:. In a kiln, the combination of a wall having opposed thickened portions with longitudinally extending recesses. and a longitudinally disposed bridge wall posi tionedat its sides in said recesses and spaced from the walls surrcnindin g` said recesses.

5. In a kiln. the combination of an outer wall, a suitably supported interior bridge wall, said bridge wall extending substantially from side to side of the outer wall, but spaced therefrom to allow for eXpansion and gas supply lines communicating with the kiln chambers through seid bridge wa l.

i n 6. In e kiln, the Combination ofen outer Wall, of a. partition or bridge Wall having openings projecting laterally therethrough, and communicating openings projeoting through oppositeedges of the brid e wall for the reception of :L iue or the li e, and the inner surface` of the outer Wall of the `kiln being inwardly curved to a point adjacent said transverse openings of the bridge Wall.

7. In a kiln, the oombination of an outer well having opposed recesses, and an inte- 

